OpenAI IPO: Date, share price, valuation, timing and all details investors need to know

OpenAI IPO valuation, filing details and expected share price: The race to own a piece of the AI revolution just got a lot more real. OpenAI, the company behind ChatGPT and arguably the most recognized name in artificial intelligence, has filed a confidential S-1 registration statement with the U.S. Securities and Exchange Commission — the first formal step toward an OpenAI IPO that Wall Street has been anticipating for years.

The OpenAI IPO filing arrives at a moment of fierce competitive pressure, surging valuations, and unresolved questions about whether any AI company can justify what the market is willing to pay. With a post-money valuation of $852 billion following its March 2025 funding round, OpenAI is not just entering the public markets — it is arriving as one of the most valuable companies ever to attempt the leap. The timing matters enormously.

Rival Anthropic filed its own confidential S-1 just one week earlier, at a valuation of $965 billion, instantly framing the OpenAI IPO as the second act in what is shaping up to be the most consequential tech listing season since Meta went public in 2012.


Sam Altman, OpenAI's CEO, acknowledged as much when the company posted its announcement on X, noting that the IPO timeline is undecided and that certain strategic moves are "likely easier as a private company." That kind of careful, almost reluctant language from a founder filing for the most anticipated OpenAI IPO in memory tells you something real about the pressure being navigated here.

OpenAI IPO valuation, filing details and expected share price explained

No company has more financial skin in the OpenAI IPO story than Microsoft. The Windows maker invested an initial $1 billion back in 2019 and eventually poured upwards of $13 billion into the company, gaining exclusive access to OpenAI's intellectual property and models in the process. When OpenAI transitioned to a for-profit structure in October 2024, Microsoft received a 27% stake in OpenAI Group PBC — valued at $135 billion at that time.

The OpenAI IPO would convert that stake into publicly traded equity, potentially making it one of the most valuable single investments in corporate history. Yet the relationship between the two companies has grown complicated. OpenAI pushed to license its IP and models to other cloud providers, a move that directly erodes Microsoft's once-exclusive advantage.

The April 2025 amendment to their partnership formalized that shift. For investors watching the OpenAI IPO, this dynamic is not a footnote — it is a central risk factor about how much of OpenAI's future value Microsoft will actually capture.

Why the OpenAI IPO Valuation Raises Hard Questions Worth Asking

At $852 billion, the OpenAI IPO would enter public markets at a valuation that exceeds most companies that have ever existed. For context, that figure sits above the market caps of giants like Visa, Walmart, and JPMorgan Chase.

The OpenAI IPO valuation demands a level of future revenue growth that the company has not yet demonstrated at scale. OpenAI's competition is formidable and well-funded — Anthropic recently closed a $65 billion funding round, and Google debuted its Gemini 3.5 model family at Google I/O just weeks ago. These are not distant threats. They are live, capable rivals chipping away at the same enterprise and consumer markets OpenAI is trying to dominate.

The OpenAI IPO will force public market investors — pension funds, retail traders, index buyers — to put a price on a business that is simultaneously the most exciting and most financially opaque in technology.

The Elon Musk Lawsuit Outcome That Cleared the OpenAI IPO Path

One obstacle that had cast a legal shadow over the OpenAI IPO was the lawsuit filed by Elon Musk against Sam Altman and Greg Brockman. Musk, a co-founder of OpenAI, accused the pair of betraying the company's original nonprofit mission by pivoting toward profit.

A California jury rejected that claim on procedural grounds — finding that Musk had filed outside the statute of limitations — and Judge Yvonne Gonzalez Rogers accepted the verdict. Musk announced plans to appeal to the Ninth Circuit, calling the outcome a "calendar technicality," but legal experts noted the appeal faces a steep climb. For the OpenAI IPO, the verdict removed what had been the most visible litigation risk standing in the way of a public debut.

OpenAI's team described it as the last major obstacle before moving forward. Whether it truly resolves the deeper questions Musk raised about the company's transformation from nonprofit to one of the most commercially aggressive AI businesses in the world — that question will follow the OpenAI IPO long after the opening bell rings.